Class: Eksa::MongoAdapter

Inherits:
Object
  • Object
show all
Defined in:
lib/eksa/database/mongo_adapter.rb

Instance Method Summary collapse

Constructor Details

#initialize(config) ⇒ MongoAdapter

Returns a new instance of MongoAdapter.



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# File 'lib/eksa/database/mongo_adapter.rb', line 5

def initialize(config)
  @uri = config&.[]('uri')
  @client = nil
end

Instance Method Details

#connection ⇒ Object 



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# File 'lib/eksa/database/mongo_adapter.rb', line 10

def connection
  return @client if @client
  raise "MongoDB URI not configured in .eksa.json" if @uri.nil? || @uri.empty?
  
  # Atlas URIs usually contain the database name, if not, we use 'eksa_db'
  @client = Mongo::Client.new(@uri)
  @client
end

#execute(sql, params = []) ⇒ Object 



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# File 'lib/eksa/database/mongo_adapter.rb', line 19

def execute(sql, params = [])
  # Minimal SQL-to-Mongo translator for Eksa models
  
  # 1. CREATE TABLE IF NOT EXISTS [table]
  if sql =~ /CREATE TABLE IF NOT EXISTS (\w+)/i
    # Mongo creates collections on the fly
    return []
  end

  # 2. SELECT * FROM [table] ...
  if sql =~ /SELECT (.*) FROM (\w+)/i
    table_name = $2
    query = {}
    
    # Handle WHERE clauses
    if sql =~ /WHERE (.*) ORDER BY/i || sql =~ /WHERE (.*) LIMIT/i || sql =~ /WHERE (.*)$/i
      where_clause = $1
      
      # Handle OR + LIKE (specific for Search)
      if where_clause =~ /(\w+) LIKE \? OR (\w+) LIKE \?/i
        field1 = $1
        field2 = $2
        # Extract keyword from params (strip % if present)
        term1 = params[0].to_s.gsub('%', '')
        term2 = params[1].to_s.gsub('%', '')
        
        query = {
          '$or' => [
            { field1.to_sym => /#{Regexp.escape(term1)}/i },
            { field2.to_sym => /#{Regexp.escape(term2)}/i }
          ]
        }
      # Handle single LIKE
      elsif where_clause =~ /(\w+) LIKE \?/i
        field = $1
        term = params[0].to_s.gsub('%', '')
        query = { field.to_sym => /#{Regexp.escape(term)}/i }
      # Handle simple field = ?
      elsif where_clause =~ /id = \?/i || where_clause =~ /_id = \?/i
        val = params[0]
        query = { _id: val.is_a?(String) ? BSON::ObjectId.from_string(val) : val }
      elsif where_clause =~ /(\w+) = \?/i
        query = { $1.to_sym => params[0] }
      end
    end

    view = connection[table_name.to_sym].find(query)
    
    # Handle ORDER BY
    if sql =~ /ORDER BY (\w+)(?: (ASC|DESC))?/i
      sort_field = $1
      direction = ($2 || 'ASC').upcase == 'DESC' ? -1 : 1
      # Mongo id maps to _id
      sort_field = '_id' if sort_field == 'id'
      view = view.sort({ sort_field => direction })
    end

    view = view.limit(1) if sql =~ /LIMIT 1/i
    results = view.to_a
    
    return results.map do |doc|
      # Try to make it look like a flat array similar to SQLite row
      # We don't know the exact schema, but we can return the values
      # For Eksa::User we specifically need [id, username, password_hash]
      if table_name == 'eksa_users'
        [doc['_id'].to_s, doc['username'], doc['password_hash'], doc['created_at']]
      else
        # For other models, return a hash-like object if possible, 
        # or just the values in order. Since User specifically uses indices, 
        # and generic models might use indices or keys, this is tricky.
        # Most Eksa models result in array-of-arrays from SQLite gem.
        doc.values.map { |v| v.is_a?(BSON::ObjectId) ? v.to_s : v }
      end
    end
  end

  # 3. INSERT INTO [table] ([cols]) VALUES ([vals])
  if sql =~ /INSERT INTO (\w+) \((.*)\) VALUES/i
    table_name = $1
    cols = $2.split(',').map(&:strip)
    doc = {}
    cols.each_with_index do |col, i|
      doc[col.to_sym] = params[i]
    end
    doc[:created_at] ||= Time.now
    
    connection[table_name.to_sym].insert_one(doc)
    return []
  end

  # 4. UPDATE [table] SET [col1] = ?, [col2] = ? WHERE [col] = ?
  if sql =~ /UPDATE (\w+) SET (.*) WHERE (\w+) = \?/i
    table_name = $1
    set_clause = $2
    where_col = $3
    
    # Parse set assignments (e.g., "col1 = ?, col2 = ?")
    # We assume the order matches params[0...n-1]
    cols = set_clause.split(',').map { |s| s.split('=').first.strip }
    
    set_data = {}
    cols.each_with_index do |col, i|
      set_data[col.to_sym] = params[i]
    end
    
    # The last parameter is the WHERE value
    where_val = params.last
    selector = if where_col == 'id'
      { _id: where_val.is_a?(String) ? BSON::ObjectId.from_string(where_val) : where_val }
    else
      { where_col.to_sym => where_val }
    end

    connection[table_name.to_sym].update_one(selector, { '$set' => set_data })
    return []
  end

  # 5. DELETE FROM [table] WHERE (\w+) = ?
  if sql =~ /DELETE FROM (\w+) WHERE (\w+) = \?/i
    table_name = $1
    where_col = $2
    
    selector = if where_col == 'id'
      { _id: params[0].is_a?(String) ? BSON::ObjectId.from_string(params[0]) : params[0] }
    else
      { where_col.to_sym => params[0] }
    end
    
    connection[table_name.to_sym].delete_one(selector)
    return []
  end

  raise "Unsupported SQL query for MongoAdapter: #{sql}"
end